// DUOTONE — the picture's luma splits at a movable balance point into two
// flat colour families, shadow and highlight, each with its own amount so
// one side can dominate the other.
{
    name: "Duotone"
    engine: "screen"
    seed: 203
    input0: "test"

    speed: 1.0
    beat_pulse: 0.4
    beat_rate: 1.0
    bar_beats: 4
    glow: 1.0
    // PERFORMANCE DIALS — mid-knob = the stock look, exact.
    p0: 0.5  p1: 0.5  p2: 0.5
    dials: [
        {name: "BALANCE", bind: "p0", default: 0.5},
        {name: "SHADOW", bind: "p1", default: 0.5},
        {name: "HIGH", bind: "p2", default: 0.5}
    ]

    color_bg: #x03040a
    color_a: #x2222aa
    color_b: #xffaa22
    color_c: #xfff0d0

    stages: [
        {kind: "bloom", threshold: 0.6, strength: 1.0, levels: 2}
    ]

    // THE LOOK LIVES HERE: the whole frame is this function. Luma splits
    // at BALANCE into col_a (shadow) and col_b (highlight); SHADOW/HIGH
    // scale each side's own amount independently.
    // Inputs: uv, content = input0 at uv, cmix = pre-gated content
    // strength. Signals: self.time_beat (time, beat, phase, pulse),
    // self.sig (bar, bpm, energy, dt), self.user (p0..p3),
    // self.col_a/b/c/bg, self.fog (density, glow, content, -).
    shader: draw.DrawVjFxScreen {
        fx_color: fn(uv: vec2, content: vec4, cmix: float) -> vec4 {
            let luma = dot(content.xyz, vec3(0.299, 0.587, 0.114))
            let mid = 0.1 + 0.8 * self.user.x
            let t = smoothstep(mid - 0.25, mid + 0.25, luma)
            let sh_amt = 0.2 + 1.6 * self.user.y
            let hi_amt = 0.2 + 1.6 * self.user.z
            let shadow = self.col_a.xyz * luma * sh_amt
            let high = self.col_b.xyz * luma * hi_amt
            let duo = shadow.mix(high, t)
            return vec4(clamp(duo, vec3(0.0, 0.0, 0.0), vec3(1.0, 1.0, 1.0)), 1.0)
        }
    }
}